Sectional sofa



FIG. 1 is a front perspective view of a sectional sofa embodying our new design;

FIG. 2 is a top plan view of the new design;

FIG. 3 is a front elevational view of the design;

FIG. 4 is a front elevational view of the design showing a backrest member in an alternate position; and,

FIG. 5 is an exploded perspective view of the design.

The portions of the article which have not been shown in the drawings form no part of the claimed design. 

The ornamental design for a sectional sofa, as shown and described. 